The Case of the Christmas Snowman (Jigsaw Jones Mystery, No. 2) Paperback – November 1, 1998 by James Preller (Author), R. W. Alley (Illustrator)
 
As the class prepares for the holidays, Jigsaw takes the case of Lucy, who has lost her father's rare coin, and the mystery means having to interview a big, tough second grader in Bigs Malone. Original.